[patch, libfortran] Implement KIND specific floating point formatted output

[François-Xavier Coudert]

:REVIEWMAIL:

> 2007-08-21  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
>
>         * io/write.c (stdbool.h): Add include. (sign_t): Move typedef to
>         new file write_float.def. Include write_float.def.
>         (extract_real): Delete. (calculate_sign): Delete.
>         (calculate_exp): Delete. (calculate_G_format): Delete.
>         (output_float): Delete. (write_float): Delete.
>         * io/write_float.def (calculate_sign): Added.
>         (output_float): Refactored to be independent of kind and added to this
>         file for inclusion. (write_infnan): New function to write "Infinite" or
>         "NaN" depending on flags passed, independent of kind.
>         (CALCULATE_EXP): New macro to build kind specific functions. Use it.
>         (OUTPUT_FLOAT_FMT_G): New macro, likewise. Use it.
>         (DTOA, DTOAL): Macros to implement "decimal to ascii".
>         (WRITE_FLOAT): New macro for kind specific write_float functions.
>         (write_float): Revised function to determine kind and use WRITE_FLOAT
>         to implement kind specific output.

OK. Sorry I took so long to look into it.